PromQL Tenant Proxy 🦀

A high-performance, lightweight HTTP proxy that extracts labels from PromQL labels and converts them into upstream HTTP headers. Built with Rust for sub-millisecond latency and memory safety.

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Overview

1. Intercepting the /api/v1/query and /api/v1/query_range requests.
2. Parsing the PromQL into an Abstract Syntax Tree (AST).
3. Extracting a specific label (e.g., env).
4. Injecting that value as a header before forwarding the request to the upstream storage.

Features

• True AST Parsing: Uses promql-parser to navigate complex queries, including nested functions, aggregations, and binary expressions.